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Posted on Aug 07, 2010
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I'm getting trouble code p1174 on a 2008 chevy uplander and bad mileage

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  • Anonymous Mar 31, 2014

    i have a code p1174 fuel trim, and cant seem to figure out the issue

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  • Posted on Nov 04, 2011
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I have an 2007 chevy uplander flexfuel i keep getting p1174 also i have replaced the the o2 sensors and the light keeps coming on
i belive it has something to do with the fuel injection system

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  • Posted on Aug 07, 2010
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P1174 IS A AIR/FUEL MIXTURE CODE POSSIBLE 02 SENSOR

  • billylovin 1 Jan 25, 2011

    p1174 air/fuel mextur on bank 1 possible 02 sensor or fuel injector or sparkplug or plugwire

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Wade is exactly right. Check your vacuum lines first... the diagram is under the hood. All modern vehicles have at least one Oxygen sensor, some have two. Some oxygen sensors are installed on the exhaust manifold DENSO and BOSCH supply oxygen sensors for most vehicles; DENSO's are slightly better. (The O2 sensors relay mixture information back to the ECU to fine tune the fuel/air mixture within certain limits.) If your oxygen sensor(s) failed, it usually due to too many unburned fuel deposits. Have a specialist check out your fuel injectors... A Bosch Service Center has a machine to check both fuel pressure and spray pattern. If you have one bad one, change them all. A fauty EGR valve; if your engine has one, can cause a mixture problem leading to poor mixture and bad gas mileage too. Might as well do this right the first time.

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